PT0E-1850

MODEL RX-8500 CONDENSED USER GUIDE
Inspections before use
1. Check that the battery level is sufficient.
2. Check that there are no bends or holes in the gas sampling hose and filter tube.
3. Check that the filter in the gas sampling probe and filter
tube are free of dust or clogging.
(3)
4. Check the gas monitor + (1) Relay tube + (2) Filter tube + (3)Gas sampling hose + (4) Gas sampling probe in order to make(4)
sure they are connected properly.

Usage

(2)
(1)

[Names of each part]

1. Turning the power on
Hold down the POWER/ENTER button (three secondsor more) until the buzzer beeps to turn the power on.
When "Filter Probe" is displayed, check that the filter
tube is connected and press the ENTER button. Thebuzzer beeps twice and then the measurement screen isdisplayed.

Buzzer soundopening

LCD display

Alarmwindow

Infrared port
Alarmwindow

Alarm window

PEAK/ESCbutton△/AIR button
PUMP/▽ button

POWER/ENTERbutton

2. Performing air calibration

When performing air calibration in atmosphere, check the atmosphere for freshness before starting.
Before performing air calibration, attach the CO2 removal filter and draw air for at least one minute.

[Attaching the CO2 removal filter]
Attach the CO2 removal filter sothat the arrow (→) on the side isfacing the filter tube. Stand theCO2 removal filter to use.
CO2 removal filter

Correct use

Incorrect use

CO2 removal filter

With the CO2 removal filter is laid
horizontally, air passes through the shaded
area and CO2 cannot be absorbed.

Stand the CO2
removal filter to use.
Filter tube

Filter tube
CO2 removal filter[Air calibration procedure screen](1)(2)⇒Press and hold the AIR
button on the measurement
screen.

Filter tube

(3)
When aircalibration iscompleted, Adj isdisplayed on thescreen.

⇒Release your finger from the AIR
button when the screen above isdisplayed.

Attach the CO2 removal filter
and press the ENTER button.

3. Performing measurements

Measure the gas concentration from the measurement screen. Put the gas sampling probe close to themeasurement area.
Once gas concentration measurement starts, the gas monitor draws in measuring gas for a certain
period of time and then displays a concentration value as the measurement result.

4. Turning the power off
Press and hold the POWER/ENTER button until the buzzer beeps three times and the LCD display
turns off.

Note: Refer to the operating manual for more details.

MODEL RX-8500 CONDENSED USER GUIDE
Usage
5. Replacing/charging the battery[Dry battery unit]
Use a flathead screwdriver or similar tool to open thebattery cover on the bottom of the main unit, andreplace the three dry batteries with new ones.

[Li-ion battery unit]
Insert the AC adapter plug into the charging jack onthe side of the battery unit to charge the battery.

Dry batteries

DangerReplace the dry battery unit and drybatteries, or charge the Li-ion battery unit
in a safe place.

Charging
jack

Plug

AC adapter

Troubleshooting
Symptoms
The power cannot be
turned on.

Abnormal operations.
Cannot operate the gasmonitor.
System abnormalities[FAIL SYSTEM]

CausesActions

The battery level is toolow.

(1) Dry battery unit: Replace all the three dry batteries with newones in a safe place.
(2) Li-ion battery unit: Charge the battery unit in a safe place.

Improper installation ofthe battery unit.
Disturbances by sudden
surge noise, etc.
Disturbances by sudden
surge noise, etc.
A main unit circuit
abnormality occurred.

Sensor abnormalities[FAIL SENSOR]

A sensor has failed.

A low battery voltage
alarm is displayed.
[FAIL BATTERY]

The battery level is low.

A low flow rate alarm isdisplayed.
[FAIL LOW FLOW]
Air calibration impossible[FAIL AIR CAL]

The reading rises (drops)
and remains.

Water, oil or the like has
been drawn in.
The gas sampling hose
is clogged.
The pump hasdeteriorated.
Fresh air is not suppliedaround the gas monitor.

Check whether the battery unit is properly attached to the main unit.
Turn off the power once and then turn it on again (restart).
Remove the battery unit in a safe place. Then reinstall it and turnon the power to perform operations.
Contact your sales outlet or closest RIKEN KEIKI dealer to request
repairs.
Contact your sales outlet or closest RIKEN KEIKI dealer to replace
the sensor. (If [FAIL] is displayed at power-on, the alarm can bereset by pressing the ESC button. The unit can continue being
used for other gases using sensors other than the failed one.)(1) Dry battery unit: Turn off the power and replace the dry batteries
with new ones in a safe place.
(2) Li-ion battery unit: Turn off the power and charge it in a safeplace.
Check the gas sampling hose for any damage or traces of drawn
water, oil, etc.
Check the gas sampling hose connections, clogging, twisting, etc.
Contact your sales outlet or closest RIKEN KEIKI dealer to replace
the pump.
Draw fresh air properly and perform air calibration again.

Drifting of sensor output.

Perform the air calibration.

Presence of interferencegas.

Check if any interference gas such as solvent is present, and takemeasures properly.
A very small amount of the gas to be measured may be leaking(slow leak). Ignoring this may result in a dangerous situation, so
take the same actions and measures as those when a gas alarm
occurs.
Perform the air calibration. In particular, the oxygen sensor isaffected by the air pressure.

Slow leak.
Environmental changes.

This troubleshooting chart is to be used as a simple guide for identifying the causes of common malfunctions.
Contact your sales outlet or closest RIKEN KEIKI dealer if your gas monitor is experiencing symptoms not listed
here, or if symptoms remain unresolved even after taking these actions.

Make sure to inspect your gas monitor once a year or more frequently,
to ensure that performance is maintained.

Note: Refer to the operating manual for more details.